Japan and South Korea said Tuesday that they would attempt negotiations with the US to scale back the impact of US President Donald Trump's proposed sharp tariff hikes starting in early August.Safe-haven gold prices slipped nearly 1% Tuesday. Spot gold dropped 0.8% to USD3,307.16 per ounce, while gold futures for August fell USD25.9 or 0.8% to USD3,316.9 per ounce.Related NewsInflation Rate MoM for Jun in United States is 0.3%, higher than the previous value of 0.1%. The forecast was 0.3%.Meanwhile, Trump announced Tuesday that he plans to slap a 50% tariff on copper imports as part of a series of industry tariffs to be implemented soon. He also said that drugmakers might be given at least a year before foreign-manufactured drugs are taxed.Copper futures for September rose 13% to USD5.6855 per pound.Silver futures for September eroded 0.4% to USD36.749 per ounce.Related NewsAPI Crude Oil Stock Change for Jul/04 in United States is 7.1M, higher than the previous value of 0.680M. The forecast was -2.8M.Platinum futures for October climbed 1.3% to USD1,391.3 per ounce.Palladium futures for September grew 0.6% to USD1,121.7 per ounce.